Instantaneous Frequencies Measurement of Multiple Microwave Signals Based on Microwave Photonics Technology

The paper presents a method for instantaneous frequencies measurement of multiple microwave signals. Proposed algorithm is based on the microwave photonic processing of microwave signals, its beats registration on the photodetector after the reflection from the fiber Bragg grating, which acts as a frequency detector. The microwave signals after photodetector are subjected to Fourier transform to obtain amplitudes and frequencies of beating signals. The ≪true≫ frequencies selection of the input signal is performed based on the proposed algorithm by eliminating additional combination frequencies arising from the beating of an optical carrier at the photodetector.